Some kids are messing around on their bikes and seeing who can leave the longest skid mark on the sidewalk. One kid makes a mark that is 9.25 m long and comes to a stop in the process. Her initial speed, just before she locked up the brakes, was 9.50m/s . Part A What was the coefficient of kinetic (sliding) friction between the tires and the ground in this case

The magnitude of the amount of energy released by burning a fuel source, measured in energy per unit mass, is called its fuel value. note that the fuel value is the negative of the isobaric specific heat of combustion for the fuel. if all the energy obtained from burning 1.23 pounds of butane with a fuel value of 10.85 kcal/g is used to heat 128.0 kg of water at an initial temperature of 18.3 °c, what is the final temperature? note that 1 lb = 453.6 g.